Watchdog group SumOfUs.org has launched a new petition calling on Apple to release workers’ clock-in and clock-out data for the last four months to prove that the new iPad was made without forcing workers into illegal and dangerous levels of overtime.

“The few months leading up to product launches are the worst time to be an Apple worker," said SumOfUs Executive Director Taren Stinebrickner-Kauffman. "Apple has a track record of putting its workers through grueling night shifts and dangerous levels of overtime to meet its artificial product launch deadlines."

The demand follows claims that Apple workers were roused en masse in the middle of the night to revamp the entire design of the first iPhone just weeks before launch.

"If Apple releases genuine, original records that demonstrate that there has been no illegal overtime at iPad factories in the lead-up to the new product launch, then we will be the first to celebrate," said Stinebrickner-Kauffman. "But until Apple proves otherwise, we can only assume that they are bluffing about caring about workers’ health and safety — and we’re calling that bluff."